Dock storage box



FIG. 1 is an enlarged perspective view of a dock storage box showing my new design;

FIG. 2 is a left side elevation thereof; the right side elevation being a mirror image;

FIG. 3 is a front elevation thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a rear side elevation thereof. 

The ornamental design for a dock storage box, as shown and described. 